The Greys carry a virus which the red have no imunity to so when they come into contact with it they die. As well as the greys being much larger and taking all the food.
Yes the grey's are from the states. There is some evidence of some natural resistance developing in the reds that are left which would really help. Also plantation programmes developing safe islands for the reds really help. The woods around Kielder in Northumberland are almost the last defence. Some populations left in Scotland too.
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